Three macroscopic physical quantities, i.e., the tilt-angle, polarization, and helical pitch, characterizing the chiral-smectic-C phase are related to one another through an equation. This equation can be derived readily from the given mean-field free energy. Here we argue and demonstrate that simultaneous measurements on those three physical quantities are important for us to make the proper choice of the free energy expansion terms which contain the wave vector associated with the helical pitch.
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fitted much better with Gi3) term than G(l) 3 and/or Gi2) term in the total free energy. Before one adds more and appropriate terms to achieve a better description of all the anomalies near the SmA-SmC* transition, we truly believe that simultaneous measurements on the tilt-angle,p olarization, and helical pitch are essential to get better understanding of the chiral smectic-C phase. This work was partially supported by the National Science Foundation, Solid-state Chemistry, Grant No. DMR-8503419 and the American Chemical Society, Petroleum Research Fund. One of us (R.J.R.) would like to express his appreciation for the support of the Undergraduate Research Opportunities Program (University of Minnesota) and Research Experiences for Undergraduates (National Science Foundation).
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